Dyestuff and process of making the same



ALLAN JAMES FIELD, OF NEW YORK, N. Y.

D YESTUFF AND PROCESS OF MAKING- THE SAME.

No Drawing.

To all whom it may concern:

Be it known that I, ALLAN JAMES FIELD, a subject of the King of Great Britain, residing in New York city, borough of Richmond, State of New York, have invented certain new and useful Improvements in Dyestuffs and Processes of Making the Same, of which the following is a full, clear, and exact specification.

This invention relates to dyestuffs, and processes of making the same, and aims to provideimprovements therein.

The invention provides a new organic compound, which, mixed and dried with dextrin, constitutes a new blue dyestufl, which has a fastness to light and a richness of color equal to certain other blue dyestuffs of the benzidin class formed of more costly and more difiicultly obtained intermediates than those used to produce the present dyestufi. In the form Hso/ Or: CH3 CH! The method of producing the dyestufiI' is as follows Specification of Letters Patent.

of the copper salt the fastnes's of the dyestuff 1s improved. The new compound or dyestufi' is suitable for lake making.

The invention further provides an economical process for making the new compound or dyestuff. The compound, especially in the form of ts copper salt, provides a compound valuable in lake making, because of its rich color, fastness to light, and insolubility in water and oil. Other metals, suchas barium, lead, aluminum calcium, or the like, may be substituted for the copper salt, though the copper salt is preferred.

The new dyestuff is derived from the combination, or combinations, of tetrazotized tolidin with 2-naphthol-6-sulfonic acid and 2-naphthol-8-sulfonic acid, which compound istbelieved to have the structural formula:

SOnH

weight of tolidin in a solution of parts by weight of 31% hydrochloric acid and 150 Patented July 5, 1921. Application filed September 27, 1917. Serial No. 193,585. I

Example: Dissolve about 10 parts by parts by weight of hot ater. 0001 down to about 5 C. and slowly add an ice-cold solution of 6.8 parts by weight of sodium nitrite in 100 parts by weight of water. Stir for about 15 minutes, and then run this liquid into a mixture of 2-naphthol-6-sulfonic acid I and 2-naphthol-8-sulfonic acid prepared as follows:

Mix parts by weight of beta-naphthol with 1 1 parts by weight of 100% sulfuric acid, and heat for two or three hours at 100 C. Dissolve in 150 parts by weight of water, and neutralize with a solution of 10.45

' Q-naphthol-S-sulfonic acid, and when pro duced by the foregoing method the two acids are in the right proportion to obtain the special shade of dyestuff desired by me.

The tetrazotized tolidin and the mixture of sulfonic acids, prepared as above, ar ethen combined, and stirred for about 2 hours.

Then 30 parts by weight of copper sulfate dissolved in 200 parts by weight of water are CH GHa thol-S-sulfonic acid the dyestuflt' (and lake made therefrom) is given a reddish shade, and by increasing the proportion of 2-naphthol-(S-sulfonic acid the dyestuff (and lake made therefrom) is given a greenishshade. By suitably increasing the proportion of one or the other of these sulfonic acids, the blue dyestuff (and lake'made therefrom) may be given desired shades of red or green. The variation in the proportion of the two sulfonic acids may be brought about in the mixture by suitable conditions of working; for example, by heating at a lower temperature or for a shorter period, a greater proportion of 2-naphthol-8-sulfonic acid is prdduced.

(What is claimed is 1. A: compound constituting a pigment color and.forming a dyestuff when mixed with dextrin, produced by combining tetrazotized tolidin with Q-naphthol-G-sulfonic acid and EZ-naphthol-S-sulfonic acid, and having probably the formula:

I 3. The-process of producing the herein de- 'mixed with dextrin, comprising producing a 2 A compound constituting a pigment and 2-naphthol-8-sulfonic acid and forming 5 color and forming a dyestufi' when mixed the copper salt, and having probably the with dextrin, produced by combining tetrazformula:

otized tolidin with 2-naphthol-6-sulfonic acid 011, cm A v I v cuiso/K/ CuiSO/ HO- I CUE'SOB fonic acid, and heating for two or. three hoursat 100 C.

scribed compound constitutlng a pigment color, and forming a blue dyestufl? when my name in the presence of two subscribing mixture 011? 2-nafphthol-6sulfolginc aclalid and witnesses. I 2-naphtho -8-sul onic aci ma t e solution alkaline, diluting. andbombinihg tetraz- ALLAN JAMES E otized tolidin with said mixture of sulfonic Witnesses:

'. acids, said mixture of sulfonic acids being GUSTAVE R. THOMPSON,

produced .by adding beta-naphthol to sul G. A. J. NIEEAUS.

In witness whereof, I have hereunto signed 20 

